If so, you will learn something even more interesting doing a clip test.

If you have several sources, test them all in the same run - just be sure to mark them differently for identification.

Matt

“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2